1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of version 2 of the GNU General Public 5 * License as published by the Free Software Foundation. 6 */ 7 #ifndef _LINUX_BPF_H 8 #define _LINUX_BPF_H 1 9 10 #include <uapi/linux/bpf.h> 11 12 #include <linux/workqueue.h> 13 #include <linux/file.h> 14 #include <linux/percpu.h> 15 #include <linux/err.h> 16 #include <linux/rbtree_latch.h> 17 #include <linux/numa.h> 18 #include <linux/wait.h> 19 20 struct bpf_verifier_env; 21 struct perf_event; 22 struct bpf_prog; 23 struct bpf_map; 24 struct sock; 25 struct seq_file; 26 struct btf_type; 27 28 /* map is generic key/value storage optionally accesible by eBPF programs */ 29 struct bpf_map_ops { 30 /* funcs callable from userspace (via syscall) */ 31 int (*map_alloc_check)(union bpf_attr *attr); 32 struct bpf_map *(*map_alloc)(union bpf_attr *attr); 33 void (*map_release)(struct bpf_map *map, struct file *map_file); 34 void (*map_free)(struct bpf_map *map); 35 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key); 36 void (*map_release_uref)(struct bpf_map *map); 37 38 /* funcs callable from userspace and from eBPF programs */ 39 void *(*map_lookup_elem)(struct bpf_map *map, void *key); 40 int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags); 41 int (*map_delete_elem)(struct bpf_map *map, void *key); 42 int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags); 43 int (*map_pop_elem)(struct bpf_map *map, void *value); 44 int (*map_peek_elem)(struct bpf_map *map, void *value); 45 46 /* funcs called by prog_array and perf_event_array map */ 47 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file, 48 int fd); 49 void (*map_fd_put_ptr)(void *ptr); 50 u32 (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf); 51 u32 (*map_fd_sys_lookup_elem)(void *ptr); 52 void (*map_seq_show_elem)(struct bpf_map *map, void *key, 53 struct seq_file *m); 54 int (*map_check_btf)(const struct bpf_map *map, 55 const struct btf_type *key_type, 56 const struct btf_type *value_type); 57 }; 58 59 struct bpf_map { 60 /* The first two cachelines with read-mostly members of which some 61 * are also accessed in fast-path (e.g. ops, max_entries). 62 */ 63 const struct bpf_map_ops *ops ____cacheline_aligned; 64 struct bpf_map *inner_map_meta; 65 #ifdef CONFIG_SECURITY 66 void *security; 67 #endif 68 enum bpf_map_type map_type; 69 u32 key_size; 70 u32 value_size; 71 u32 max_entries; 72 u32 map_flags; 73 u32 pages; 74 u32 id; 75 int numa_node; 76 u32 btf_key_type_id; 77 u32 btf_value_type_id; 78 struct btf *btf; 79 bool unpriv_array; 80 /* 55 bytes hole */ 81 82 /* The 3rd and 4th cacheline with misc members to avoid false sharing 83 * particularly with refcounting. 84 */ 85 struct user_struct *user ____cacheline_aligned; 86 atomic_t refcnt; 87 atomic_t usercnt; 88 struct work_struct work; 89 char name[BPF_OBJ_NAME_LEN]; 90 }; 91 92 struct bpf_offload_dev; 93 struct bpf_offloaded_map; 94 95 struct bpf_map_dev_ops { 96 int (*map_get_next_key)(struct bpf_offloaded_map *map, 97 void *key, void *next_key); 98 int (*map_lookup_elem)(struct bpf_offloaded_map *map, 99 void *key, void *value); 100 int (*map_update_elem)(struct bpf_offloaded_map *map, 101 void *key, void *value, u64 flags); 102 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key); 103 }; 104 105 struct bpf_offloaded_map { 106 struct bpf_map map; 107 struct net_device *netdev; 108 const struct bpf_map_dev_ops *dev_ops; 109 void *dev_priv; 110 struct list_head offloads; 111 }; 112 113 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map) 114 { 115 return container_of(map, struct bpf_offloaded_map, map); 116 } 117 118 static inline bool bpf_map_offload_neutral(const struct bpf_map *map) 119 { 120 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY; 121 } 122 123 static inline bool bpf_map_support_seq_show(const struct bpf_map *map) 124 { 125 return map->btf && map->ops->map_seq_show_elem; 126 } 127 128 int map_check_no_btf(const struct bpf_map *map, 129 const struct btf_type *key_type, 130 const struct btf_type *value_type); 131 132 extern const struct bpf_map_ops bpf_map_offload_ops; 133 134 /* function argument constraints */ 135 enum bpf_arg_type { 136 ARG_DONTCARE = 0, /* unused argument in helper function */ 137 138 /* the following constraints used to prototype 139 * bpf_map_lookup/update/delete_elem() functions 140 */ 141 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */ 142 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */ 143 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */ 144 ARG_PTR_TO_UNINIT_MAP_VALUE, /* pointer to valid memory used to store a map value */ 145 146 /* the following constraints used to prototype bpf_memcmp() and other 147 * functions that access data on eBPF program stack 148 */ 149 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */ 150 ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */ 151 ARG_PTR_TO_UNINIT_MEM, /* pointer to memory does not need to be initialized, 152 * helper function must fill all bytes or clear 153 * them in error case. 154 */ 155 156 ARG_CONST_SIZE, /* number of bytes accessed from memory */ 157 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */ 158 159 ARG_PTR_TO_CTX, /* pointer to context */ 160 ARG_ANYTHING, /* any (initialized) argument is ok */ 161 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock */ 162 }; 163 164 /* type of values returned from helper functions */ 165 enum bpf_return_type { 166 RET_INTEGER, /* function returns integer */ 167 RET_VOID, /* function doesn't return anything */ 168 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */ 169 RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ 170 RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ 171 }; 172 173 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs 174 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL 175 * instructions after verifying 176 */ 177 struct bpf_func_proto { 178 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 179 bool gpl_only; 180 bool pkt_access; 181 enum bpf_return_type ret_type; 182 enum bpf_arg_type arg1_type; 183 enum bpf_arg_type arg2_type; 184 enum bpf_arg_type arg3_type; 185 enum bpf_arg_type arg4_type; 186 enum bpf_arg_type arg5_type; 187 }; 188 189 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is 190 * the first argument to eBPF programs. 191 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *' 192 */ 193 struct bpf_context; 194 195 enum bpf_access_type { 196 BPF_READ = 1, 197 BPF_WRITE = 2 198 }; 199 200 /* types of values stored in eBPF registers */ 201 /* Pointer types represent: 202 * pointer 203 * pointer + imm 204 * pointer + (u16) var 205 * pointer + (u16) var + imm 206 * if (range > 0) then [ptr, ptr + range - off) is safe to access 207 * if (id > 0) means that some 'var' was added 208 * if (off > 0) means that 'imm' was added 209 */ 210 enum bpf_reg_type { 211 NOT_INIT = 0, /* nothing was written into register */ 212 SCALAR_VALUE, /* reg doesn't contain a valid pointer */ 213 PTR_TO_CTX, /* reg points to bpf_context */ 214 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */ 215 PTR_TO_MAP_VALUE, /* reg points to map element value */ 216 PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */ 217 PTR_TO_STACK, /* reg == frame_pointer + offset */ 218 PTR_TO_PACKET_META, /* skb->data - meta_len */ 219 PTR_TO_PACKET, /* reg points to skb->data */ 220 PTR_TO_PACKET_END, /* skb->data + headlen */ 221 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */ 222 PTR_TO_SOCKET, /* reg points to struct bpf_sock */ 223 PTR_TO_SOCKET_OR_NULL, /* reg points to struct bpf_sock or NULL */ 224 }; 225 226 /* The information passed from prog-specific *_is_valid_access 227 * back to the verifier. 228 */ 229 struct bpf_insn_access_aux { 230 enum bpf_reg_type reg_type; 231 int ctx_field_size; 232 }; 233 234 static inline void 235 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size) 236 { 237 aux->ctx_field_size = size; 238 } 239 240 struct bpf_prog_ops { 241 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, 242 union bpf_attr __user *uattr); 243 }; 244 245 struct bpf_verifier_ops { 246 /* return eBPF function prototype for verification */ 247 const struct bpf_func_proto * 248 (*get_func_proto)(enum bpf_func_id func_id, 249 const struct bpf_prog *prog); 250 251 /* return true if 'size' wide access at offset 'off' within bpf_context 252 * with 'type' (read or write) is allowed 253 */ 254 bool (*is_valid_access)(int off, int size, enum bpf_access_type type, 255 const struct bpf_prog *prog, 256 struct bpf_insn_access_aux *info); 257 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write, 258 const struct bpf_prog *prog); 259 int (*gen_ld_abs)(const struct bpf_insn *orig, 260 struct bpf_insn *insn_buf); 261 u32 (*convert_ctx_access)(enum bpf_access_type type, 262 const struct bpf_insn *src, 263 struct bpf_insn *dst, 264 struct bpf_prog *prog, u32 *target_size); 265 }; 266 267 struct bpf_prog_offload_ops { 268 int (*insn_hook)(struct bpf_verifier_env *env, 269 int insn_idx, int prev_insn_idx); 270 int (*finalize)(struct bpf_verifier_env *env); 271 }; 272 273 struct bpf_prog_offload { 274 struct bpf_prog *prog; 275 struct net_device *netdev; 276 void *dev_priv; 277 struct list_head offloads; 278 bool dev_state; 279 const struct bpf_prog_offload_ops *dev_ops; 280 void *jited_image; 281 u32 jited_len; 282 }; 283 284 enum bpf_cgroup_storage_type { 285 BPF_CGROUP_STORAGE_SHARED, 286 BPF_CGROUP_STORAGE_PERCPU, 287 __BPF_CGROUP_STORAGE_MAX 288 }; 289 290 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX 291 292 struct bpf_prog_aux { 293 atomic_t refcnt; 294 u32 used_map_cnt; 295 u32 max_ctx_offset; 296 u32 stack_depth; 297 u32 id; 298 u32 func_cnt; 299 bool offload_requested; 300 struct bpf_prog **func; 301 void *jit_data; /* JIT specific data. arch dependent */ 302 struct latch_tree_node ksym_tnode; 303 struct list_head ksym_lnode; 304 const struct bpf_prog_ops *ops; 305 struct bpf_map **used_maps; 306 struct bpf_prog *prog; 307 struct user_struct *user; 308 u64 load_time; /* ns since boottime */ 309 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 310 char name[BPF_OBJ_NAME_LEN]; 311 #ifdef CONFIG_SECURITY 312 void *security; 313 #endif 314 struct bpf_prog_offload *offload; 315 union { 316 struct work_struct work; 317 struct rcu_head rcu; 318 }; 319 }; 320 321 struct bpf_array { 322 struct bpf_map map; 323 u32 elem_size; 324 u32 index_mask; 325 /* 'ownership' of prog_array is claimed by the first program that 326 * is going to use this map or by the first program which FD is stored 327 * in the map to make sure that all callers and callees have the same 328 * prog_type and JITed flag 329 */ 330 enum bpf_prog_type owner_prog_type; 331 bool owner_jited; 332 union { 333 char value[0] __aligned(8); 334 void *ptrs[0] __aligned(8); 335 void __percpu *pptrs[0] __aligned(8); 336 }; 337 }; 338 339 #define MAX_TAIL_CALL_CNT 32 340 341 struct bpf_event_entry { 342 struct perf_event *event; 343 struct file *perf_file; 344 struct file *map_file; 345 struct rcu_head rcu; 346 }; 347 348 bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp); 349 int bpf_prog_calc_tag(struct bpf_prog *fp); 350 351 const struct bpf_func_proto *bpf_get_trace_printk_proto(void); 352 353 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, 354 unsigned long off, unsigned long len); 355 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type, 356 const struct bpf_insn *src, 357 struct bpf_insn *dst, 358 struct bpf_prog *prog, 359 u32 *target_size); 360 361 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 362 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy); 363 364 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 365 union bpf_attr __user *uattr); 366 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 367 union bpf_attr __user *uattr); 368 369 /* an array of programs to be executed under rcu_lock. 370 * 371 * Typical usage: 372 * ret = BPF_PROG_RUN_ARRAY(&bpf_prog_array, ctx, BPF_PROG_RUN); 373 * 374 * the structure returned by bpf_prog_array_alloc() should be populated 375 * with program pointers and the last pointer must be NULL. 376 * The user has to keep refcnt on the program and make sure the program 377 * is removed from the array before bpf_prog_put(). 378 * The 'struct bpf_prog_array *' should only be replaced with xchg() 379 * since other cpus are walking the array of pointers in parallel. 380 */ 381 struct bpf_prog_array_item { 382 struct bpf_prog *prog; 383 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]; 384 }; 385 386 struct bpf_prog_array { 387 struct rcu_head rcu; 388 struct bpf_prog_array_item items[0]; 389 }; 390 391 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags); 392 void bpf_prog_array_free(struct bpf_prog_array __rcu *progs); 393 int bpf_prog_array_length(struct bpf_prog_array __rcu *progs); 394 int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs, 395 __u32 __user *prog_ids, u32 cnt); 396 397 void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs, 398 struct bpf_prog *old_prog); 399 int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array, 400 u32 *prog_ids, u32 request_cnt, 401 u32 *prog_cnt); 402 int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array, 403 struct bpf_prog *exclude_prog, 404 struct bpf_prog *include_prog, 405 struct bpf_prog_array **new_array); 406 407 #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null) \ 408 ({ \ 409 struct bpf_prog_array_item *_item; \ 410 struct bpf_prog *_prog; \ 411 struct bpf_prog_array *_array; \ 412 u32 _ret = 1; \ 413 preempt_disable(); \ 414 rcu_read_lock(); \ 415 _array = rcu_dereference(array); \ 416 if (unlikely(check_non_null && !_array))\ 417 goto _out; \ 418 _item = &_array->items[0]; \ 419 while ((_prog = READ_ONCE(_item->prog))) { \ 420 bpf_cgroup_storage_set(_item->cgroup_storage); \ 421 _ret &= func(_prog, ctx); \ 422 _item++; \ 423 } \ 424 _out: \ 425 rcu_read_unlock(); \ 426 preempt_enable_no_resched(); \ 427 _ret; \ 428 }) 429 430 #define BPF_PROG_RUN_ARRAY(array, ctx, func) \ 431 __BPF_PROG_RUN_ARRAY(array, ctx, func, false) 432 433 #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func) \ 434 __BPF_PROG_RUN_ARRAY(array, ctx, func, true) 435 436 #ifdef CONFIG_BPF_SYSCALL 437 DECLARE_PER_CPU(int, bpf_prog_active); 438 439 extern const struct file_operations bpf_map_fops; 440 extern const struct file_operations bpf_prog_fops; 441 442 #define BPF_PROG_TYPE(_id, _name) \ 443 extern const struct bpf_prog_ops _name ## _prog_ops; \ 444 extern const struct bpf_verifier_ops _name ## _verifier_ops; 445 #define BPF_MAP_TYPE(_id, _ops) \ 446 extern const struct bpf_map_ops _ops; 447 #include <linux/bpf_types.h> 448 #undef BPF_PROG_TYPE 449 #undef BPF_MAP_TYPE 450 451 extern const struct bpf_prog_ops bpf_offload_prog_ops; 452 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops; 453 extern const struct bpf_verifier_ops xdp_analyzer_ops; 454 455 struct bpf_prog *bpf_prog_get(u32 ufd); 456 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 457 bool attach_drv); 458 struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); 459 void bpf_prog_sub(struct bpf_prog *prog, int i); 460 struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); 461 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); 462 void bpf_prog_put(struct bpf_prog *prog); 463 int __bpf_prog_charge(struct user_struct *user, u32 pages); 464 void __bpf_prog_uncharge(struct user_struct *user, u32 pages); 465 466 void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock); 467 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock); 468 469 struct bpf_map *bpf_map_get_with_uref(u32 ufd); 470 struct bpf_map *__bpf_map_get(struct fd f); 471 struct bpf_map * __must_check bpf_map_inc(struct bpf_map *map, bool uref); 472 void bpf_map_put_with_uref(struct bpf_map *map); 473 void bpf_map_put(struct bpf_map *map); 474 int bpf_map_precharge_memlock(u32 pages); 475 int bpf_map_charge_memlock(struct bpf_map *map, u32 pages); 476 void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages); 477 void *bpf_map_area_alloc(size_t size, int numa_node); 478 void bpf_map_area_free(void *base); 479 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr); 480 481 extern int sysctl_unprivileged_bpf_disabled; 482 483 int bpf_map_new_fd(struct bpf_map *map, int flags); 484 int bpf_prog_new_fd(struct bpf_prog *prog); 485 486 int bpf_obj_pin_user(u32 ufd, const char __user *pathname); 487 int bpf_obj_get_user(const char __user *pathname, int flags); 488 489 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value); 490 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value); 491 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value, 492 u64 flags); 493 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value, 494 u64 flags); 495 496 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value); 497 498 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file, 499 void *key, void *value, u64 map_flags); 500 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 501 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file, 502 void *key, void *value, u64 map_flags); 503 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value); 504 505 int bpf_get_file_flag(int flags); 506 int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size, 507 size_t actual_size); 508 509 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and 510 * forced to use 'long' read/writes to try to atomically copy long counters. 511 * Best-effort only. No barriers here, since it _will_ race with concurrent 512 * updates from BPF programs. Called from bpf syscall and mostly used with 513 * size 8 or 16 bytes, so ask compiler to inline it. 514 */ 515 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size) 516 { 517 const long *lsrc = src; 518 long *ldst = dst; 519 520 size /= sizeof(long); 521 while (size--) 522 *ldst++ = *lsrc++; 523 } 524 525 /* verify correctness of eBPF program */ 526 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 527 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); 528 529 /* Map specifics */ 530 struct xdp_buff; 531 struct sk_buff; 532 533 struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key); 534 void __dev_map_insert_ctx(struct bpf_map *map, u32 index); 535 void __dev_map_flush(struct bpf_map *map); 536 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 537 struct net_device *dev_rx); 538 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, 539 struct bpf_prog *xdp_prog); 540 541 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key); 542 void __cpu_map_insert_ctx(struct bpf_map *map, u32 index); 543 void __cpu_map_flush(struct bpf_map *map); 544 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp, 545 struct net_device *dev_rx); 546 547 /* Return map's numa specified by userspace */ 548 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr) 549 { 550 return (attr->map_flags & BPF_F_NUMA_NODE) ? 551 attr->numa_node : NUMA_NO_NODE; 552 } 553 554 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type); 555 int array_map_alloc_check(union bpf_attr *attr); 556 557 #else /* !CONFIG_BPF_SYSCALL */ 558 static inline struct bpf_prog *bpf_prog_get(u32 ufd) 559 { 560 return ERR_PTR(-EOPNOTSUPP); 561 } 562 563 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, 564 enum bpf_prog_type type, 565 bool attach_drv) 566 { 567 return ERR_PTR(-EOPNOTSUPP); 568 } 569 570 static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, 571 int i) 572 { 573 return ERR_PTR(-EOPNOTSUPP); 574 } 575 576 static inline void bpf_prog_sub(struct bpf_prog *prog, int i) 577 { 578 } 579 580 static inline void bpf_prog_put(struct bpf_prog *prog) 581 { 582 } 583 584 static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) 585 { 586 return ERR_PTR(-EOPNOTSUPP); 587 } 588 589 static inline struct bpf_prog *__must_check 590 bpf_prog_inc_not_zero(struct bpf_prog *prog) 591 { 592 return ERR_PTR(-EOPNOTSUPP); 593 } 594 595 static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) 596 { 597 return 0; 598 } 599 600 static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 601 { 602 } 603 604 static inline int bpf_obj_get_user(const char __user *pathname, int flags) 605 { 606 return -EOPNOTSUPP; 607 } 608 609 static inline struct net_device *__dev_map_lookup_elem(struct bpf_map *map, 610 u32 key) 611 { 612 return NULL; 613 } 614 615 static inline void __dev_map_insert_ctx(struct bpf_map *map, u32 index) 616 { 617 } 618 619 static inline void __dev_map_flush(struct bpf_map *map) 620 { 621 } 622 623 struct xdp_buff; 624 struct bpf_dtab_netdev; 625 626 static inline 627 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, 628 struct net_device *dev_rx) 629 { 630 return 0; 631 } 632 633 struct sk_buff; 634 635 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, 636 struct sk_buff *skb, 637 struct bpf_prog *xdp_prog) 638 { 639 return 0; 640 } 641 642 static inline 643 struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key) 644 { 645 return NULL; 646 } 647 648 static inline void __cpu_map_insert_ctx(struct bpf_map *map, u32 index) 649 { 650 } 651 652 static inline void __cpu_map_flush(struct bpf_map *map) 653 { 654 } 655 656 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, 657 struct xdp_buff *xdp, 658 struct net_device *dev_rx) 659 { 660 return 0; 661 } 662 663 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name, 664 enum bpf_prog_type type) 665 { 666 return ERR_PTR(-EOPNOTSUPP); 667 } 668 #endif /* CONFIG_BPF_SYSCALL */ 669 670 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd, 671 enum bpf_prog_type type) 672 { 673 return bpf_prog_get_type_dev(ufd, type, false); 674 } 675 676 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool); 677 678 int bpf_prog_offload_compile(struct bpf_prog *prog); 679 void bpf_prog_offload_destroy(struct bpf_prog *prog); 680 int bpf_prog_offload_info_fill(struct bpf_prog_info *info, 681 struct bpf_prog *prog); 682 683 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map); 684 685 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value); 686 int bpf_map_offload_update_elem(struct bpf_map *map, 687 void *key, void *value, u64 flags); 688 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key); 689 int bpf_map_offload_get_next_key(struct bpf_map *map, 690 void *key, void *next_key); 691 692 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map); 693 694 struct bpf_offload_dev *bpf_offload_dev_create(void); 695 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev); 696 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev, 697 struct net_device *netdev); 698 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev, 699 struct net_device *netdev); 700 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev); 701 702 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL) 703 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr); 704 705 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux) 706 { 707 return aux->offload_requested; 708 } 709 710 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 711 { 712 return unlikely(map->ops == &bpf_map_offload_ops); 713 } 714 715 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr); 716 void bpf_map_offload_map_free(struct bpf_map *map); 717 #else 718 static inline int bpf_prog_offload_init(struct bpf_prog *prog, 719 union bpf_attr *attr) 720 { 721 return -EOPNOTSUPP; 722 } 723 724 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux) 725 { 726 return false; 727 } 728 729 static inline bool bpf_map_is_dev_bound(struct bpf_map *map) 730 { 731 return false; 732 } 733 734 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr) 735 { 736 return ERR_PTR(-EOPNOTSUPP); 737 } 738 739 static inline void bpf_map_offload_map_free(struct bpf_map *map) 740 { 741 } 742 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */ 743 744 #if defined(CONFIG_BPF_STREAM_PARSER) 745 int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which); 746 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); 747 #else 748 static inline int sock_map_prog_update(struct bpf_map *map, 749 struct bpf_prog *prog, u32 which) 750 { 751 return -EOPNOTSUPP; 752 } 753 754 static inline int sock_map_get_from_fd(const union bpf_attr *attr, 755 struct bpf_prog *prog) 756 { 757 return -EINVAL; 758 } 759 #endif 760 761 #if defined(CONFIG_XDP_SOCKETS) 762 struct xdp_sock; 763 struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key); 764 int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 765 struct xdp_sock *xs); 766 void __xsk_map_flush(struct bpf_map *map); 767 #else 768 struct xdp_sock; 769 static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, 770 u32 key) 771 { 772 return NULL; 773 } 774 775 static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp, 776 struct xdp_sock *xs) 777 { 778 return -EOPNOTSUPP; 779 } 780 781 static inline void __xsk_map_flush(struct bpf_map *map) 782 { 783 } 784 #endif 785 786 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) 787 void bpf_sk_reuseport_detach(struct sock *sk); 788 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key, 789 void *value); 790 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key, 791 void *value, u64 map_flags); 792 #else 793 static inline void bpf_sk_reuseport_detach(struct sock *sk) 794 { 795 } 796 797 #ifdef CONFIG_BPF_SYSCALL 798 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, 799 void *key, void *value) 800 { 801 return -EOPNOTSUPP; 802 } 803 804 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, 805 void *key, void *value, 806 u64 map_flags) 807 { 808 return -EOPNOTSUPP; 809 } 810 #endif /* CONFIG_BPF_SYSCALL */ 811 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */ 812 813 /* verifier prototypes for helper functions called from eBPF programs */ 814 extern const struct bpf_func_proto bpf_map_lookup_elem_proto; 815 extern const struct bpf_func_proto bpf_map_update_elem_proto; 816 extern const struct bpf_func_proto bpf_map_delete_elem_proto; 817 extern const struct bpf_func_proto bpf_map_push_elem_proto; 818 extern const struct bpf_func_proto bpf_map_pop_elem_proto; 819 extern const struct bpf_func_proto bpf_map_peek_elem_proto; 820 821 extern const struct bpf_func_proto bpf_get_prandom_u32_proto; 822 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; 823 extern const struct bpf_func_proto bpf_get_numa_node_id_proto; 824 extern const struct bpf_func_proto bpf_tail_call_proto; 825 extern const struct bpf_func_proto bpf_ktime_get_ns_proto; 826 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto; 827 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto; 828 extern const struct bpf_func_proto bpf_get_current_comm_proto; 829 extern const struct bpf_func_proto bpf_get_stackid_proto; 830 extern const struct bpf_func_proto bpf_get_stack_proto; 831 extern const struct bpf_func_proto bpf_sock_map_update_proto; 832 extern const struct bpf_func_proto bpf_sock_hash_update_proto; 833 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto; 834 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto; 835 extern const struct bpf_func_proto bpf_msg_redirect_map_proto; 836 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto; 837 extern const struct bpf_func_proto bpf_sk_redirect_map_proto; 838 839 extern const struct bpf_func_proto bpf_get_local_storage_proto; 840 841 /* Shared helpers among cBPF and eBPF. */ 842 void bpf_user_rnd_init_once(void); 843 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 844 845 #if defined(CONFIG_NET) 846 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 847 struct bpf_insn_access_aux *info); 848 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 849 const struct bpf_insn *si, 850 struct bpf_insn *insn_buf, 851 struct bpf_prog *prog, 852 u32 *target_size); 853 #else 854 static inline bool bpf_sock_is_valid_access(int off, int size, 855 enum bpf_access_type type, 856 struct bpf_insn_access_aux *info) 857 { 858 return false; 859 } 860 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 861 const struct bpf_insn *si, 862 struct bpf_insn *insn_buf, 863 struct bpf_prog *prog, 864 u32 *target_size) 865 { 866 return 0; 867 } 868 #endif 869 870 #endif /* _LINUX_BPF_H */ 871